westwood



No. 607,312. Patented luly l2, I898. A. L. WESTWODD.

PULP STRAINER FOR PAPER MAKING MACHINES.

(Applicn tion filed Feb. 9, 1898.) (No Model.) 2 Sheets$heet I.

YHE NORRIS PETERS ca. mm'oumou WASNNOYON, n, c.

Patented July l2, |898.'

.A. L. WESTWOUD.

PULP STRAINEB FOR PAPER MAKING MACHINES.-

(Application filed Feb. 9, 1898.)

(No Model.)

uomus nzrzns co. mmoum NITED STATES PATENT OFFICE.

ALEXANDER LAWRENCE VVESTWOOD, OF EDINBURGH, SCOTLAND.

PULP-STRAINER FOR PAPER-MAKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 607,312, dated July 12,1898.

Application filed February 9, 1898. Serial No. 669,633. (No model.)

To all whom it may concern:

Be it known that I, ALEXANDER LAWRENCE IVESTWOOD, consulting engineer, asubject of the Queen of the United Kingdom of Great Britain and Ireland,residing at 5 Easter road, Edinburgh, Scotland, have invented newImprovements in Pulp-Strainers for Paper-Making Machines and the Like,of which the following is a specification.

This invention relates to improvements in pulp-strainers forpaper-making machines and the like and it consists,essentially, inimparting a rotary motion to the'strainer-plates of the class ofstrainers in which the plates are placed in a horizontal position,whereby the working surface of the plates is moved under the wash of thepulp flowing on to be strained, and thereby kept clear of refuse matter,which is discharged to the edges of the plates and into a channel; andin order that my said invention and the manner of performing the samemay be properly understood I have hereunto appended a sheet ofexplanatory drawings, in which the same reference-letters are used toindicate like parts in the several figures where shown.

Figure 1 is a side elevation, and Fig. 2 a sectional elevation at rightangles to Fig. 1, and Fig. 3 is a plan, of my invention.

In carrying out the invention the strainer is preferably circular, andthe strainer-plates A are fixed in a frame B, which rotates about avertical or slightly-inclined axis in a vat O and is formed with arefuse-channelD at the periphery of the plates, the vat 0 beingsupported by upright standards E from the soleplate F. The saidplate-carrying frame B is supported on the conical head of a verticalspindle G (which admits of its being raised out of the vat for cleaning)and is rotated by any convenient'gearing from below, such as by thehorizontal shaft II, which operates the pulsating diaphragm. The saidshaft II has a small pulley I keyed upon it, which drives a largerpulley J immediately above it by means of a driving-belt K. The pulley Joperates a worm L, which is engaged with a worm-wheel M, keyed upon thespindle G.

strainer in the usual manner. The pulsating diaphragm Q is of cast-ironor other metal, and its inner periphery is connected to the cup-shapedportion of the strained-pulp-discharge pipes R through the medium of anindia-rubber or other ring, the outer periphery being elasticallyconnected to the inner periphery of the vat C in a similar manner. Thediaphragm is supported by springs S and made to pulsate by means of rodsT, fixed to it and jointed upon small throw-cranks on the rotating shaftH in the usual manner or by cams or eccentrics, as may be found mostconvenient in practice. The mouth of the onflowing pipe of the pulp tobe strained (not shown) may be of such a width as to cause a Wide flowof pulp onto the strainer-plates, or the said discharge-mouth maybedivided into two, three, or more contracted months. As the pulp rushesfrom this pipe onto the plates between the center of their rotating axisand their periphery and against the direction of the rotation of theplates the refuse already on the plates is arrested by the flow anddiverted to the periphery of the plates and into the discharge-channeland pipes to auxiliary strainer. The strained pulp is led away by thepipe R,which is attached to the port in the vat and is formed with thecup-shaped center 0, fitted with stuffing-boxes and glands. Aregulating-box is fixed to the pipe-outlet, as usual, to regulate thelevel of the pulp.

I claim- In a rotary pulp-strainer, the combination of a fixed vat, arotary frame carrying horizontal strainer-plates, a substantiallyvertical axis, on which said frame rotates, a circular channel on saidframe on the outer side of the strainer-plates, a refuse-discharge pipeleading from the center of the frame, pipes leading from the aforesaidchannel to the said discharge-pipes, a pulp-discharge pipe having acup-shaped portion extending under the rotary strainer-plates, apulsating diaphragm in said cup-shaped portion, means for pulsating saiddiaphragm and means for rotating the strainer-carrying frame.

ALEXANDER LAWRENCE WES'IWOOD.

Witnesses:

GEORGE Conn, J. Snurson JACK.

